Enable user change background image in settings page in Aura build.

chrome/browser/chromeos/login/user_manager_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_IMPL_H_
 #pragma once
 
 #include <string>
 
@@ skipping 42 matching lines @@
   virtual User& logged_in_user() OVERRIDE;
   virtual bool IsDisplayNameUnique(
       const std::string& display_name) const OVERRIDE;
   virtual void SaveUserOAuthStatus(
       const std::string& username,
       User::OAuthTokenStatus oauth_token_status) OVERRIDE;
   virtual void SaveUserDisplayEmail(const std::string& username,
                                     const std::string& display_email) OVERRIDE;
   virtual std::string GetUserDisplayEmail(
       const std::string& username) const OVERRIDE;
+  virtual int GetUserWallpaper(const std::string& username) OVERRIDE;
+  virtual void SaveWallpaperDefaultIndex(const std::string& username,
+                                         int wallpaper_index) OVERRIDE;
   virtual void SaveUserDefaultImageIndex(const std::string& username,
                                          int image_index) OVERRIDE;
   virtual void SaveUserImage(const std::string& username,
                              const SkBitmap& image) OVERRIDE;
   virtual void SaveUserImageFromFile(const std::string& username,
                                      const FilePath& path) OVERRIDE;
   virtual void SaveUserImageFromProfileImage(
       const std::string& username) OVERRIDE;
   virtual void DownloadProfileImage(const std::string& reason) OVERRIDE;
   virtual bool current_user_is_owner() const OVERRIDE;
@@ skipping 160 matching lines @@
 
   // Data URL for |downloaded_profile_image_|.
   std::string downloaded_profile_image_data_url_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_MANAGER_IMPL_H_